all I had to do was to move the .pak files to the id1 directory of quake1. They were missing, in fact. But these files are from the original CD of Quake 1, perhaps they are available in some dark place in internet...

This might be worth a bug report, recommending that einfo or ewarn messages should be added to the ebuild notifying the user that the content must be installed separately, perhaps even referencing the tutorial you found.

- John_________________I can confirm that I have received between 0 and 999 National Security Letters.